EP0383664A1 - Apparatus for manufacturing nettings with perforations or hollows distributed over their surfaces - Google Patents

Apparatus for manufacturing nettings with perforations or hollows distributed over their surfaces Download PDF

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Publication number
EP0383664A1
EP0383664A1 EP90400373A EP90400373A EP0383664A1 EP 0383664 A1 EP0383664 A1 EP 0383664A1 EP 90400373 A EP90400373 A EP 90400373A EP 90400373 A EP90400373 A EP 90400373A EP 0383664 A1 EP0383664 A1 EP 0383664A1
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EP
European Patent Office
Prior art keywords
crown
fixed
ring
film
contact
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Granted
Application number
EP90400373A
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German (de)
French (fr)
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EP0383664B1 (en
Inventor
Jacques Hureau
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/301—Extrusion nozzles or dies having reciprocating, oscillating or rotating parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2028/00—Nets or the like

Definitions

  • the present invention relates to the manufacture of a mesh produced by extrusion of a structure in synthetic material from a circular die.
  • a type of extrusion head is known in particular for this manufacture, comprising an extrusion slot defined between two circular walls including an outer wall; and on this outer wall is supported a circular wheel constantly eccentric and animated by a nutation movement along an axis collinear with the circular extrusion slot.
  • the wheel has indentations on its periphery indentations which come to bear on the film coming from the extrusion slot and in abutment on the external wall, so that these indentations cause the formation openings, recesses or perforations, which can then be enlarged by stretching, thereby achieving a incomplete structure.
  • the indentations are provided not on the central gear but on the outer wall of the extrusion slot and the central wheel which has a circular edge presses the film on the provided indentations on this outer wall always causing under the same conditions the formation of openings, perforations or recesses.
  • the invention relates to improvements to extraction devices of this type.
  • the material of the thermoplastic film leaving the extrusion slot in a plastic state can come to be applied to the external wall of the extrusion slot which precisely constitutes a bearing wall on which the internal toothed wheel comes to bear. .
  • the plastic may then tend to adhere to this wall and it is only peeled off by the subsequent call of the mesh; it follows jerks related to movements of adhesion and detachment by area of the synthetic material which consequently causes inequalities and deformations with an irregular and disadvantageous appearance of the products.
  • This defect can be all the more marked when one seeks to obtain high production rates, and for certain qualities or mixture of plastic material.
  • the invention relates, to remedy the above drawbacks, a device for manufacturing a tubular film of incomplete structure, of the type in which the tubular film extruded from a circular extrusion slot, receives a series of perforations arranged in a helical path along the walls of the tubular film, the latter being for this purpose inserted between two non-concentric circular rings, one outer ring constituting the outer wall of the extrusion slot and one inner ring one of the two crowns being mounted mobile and animated by a nutation movement around an axis collinear with the axis of the fixed crown, the movement of the mobile crown bringing it into contact with the wall of the fixed crown according to a point of contact which moves continuously on the inner circumference of this fixed crown, and one of the crowns having on its face in contact with the other crown proper indentations es to perforate the film in the contact area between the two crowns, and the device is characterized in that the crowns are arranged in relation to each other that the action of incision
  • the film is thus prevented from being pushed back and pressed against the wall of the fixed ring, coming into the adhesion position.
  • the action of the movable crown therefore repels the film to allow the incision of the film by the play of indentations (arranged either on the fixed crown or on the movable crown), but without causing the film to be pressed downstream of the incision on a support wall which, due to the still plastic nature of the recently extruded film, would cause the film to adhere to the support wall.
  • the device is characterized in that the range of the movable crown on the fixed crown is made along a contact line coincident with the lower and inner angle of said fixed crown.
  • the indentations are arranged on the movable inner ring and they are oriented in a centrifugal direction towards the fixed ring.
  • the indentations are arranged on the fixed crown and they are oriented in a centripetal direction towards the central or internal movable crown.
  • the device comprises a precalibration slot making it possible to determine the thickness of the film, this slot being arranged upstream of the extrusion slot.
  • the extrusion slot 1 allowing the flow of the film of synthetic material 2 is defined by the space between an outer fixed ring 3 and the central cylinder 4.
  • the perforations 5.5 ′ are obtained by the play of the crown toothed 6 which moves according to a nutation movement previously described so that this ring is constantly eccentric relative to the extrusion slot; an edge of the ring gear is therefore constantly in the partially interrupted position across the extrusion slot; but this interrupting edge moves regularly and in a continuous movement along the slit.
  • the indentations 6a of the toothed crown are provided to face the angle 7 corresponding to the interior and lower angle of the fixed crown 3.
  • the indentations could be present precisely at the level of the interior and lower angle 7 of the crown 3 and receive the support of the interior movable crown 6 which would offer a continuous circular edge then coming cooperate with crown indentations fixed to temporarily close the area of the extrusion slot in which the movable ring comes into contact with the fixed ring; this obturation zone moving with the nutation movement of the movable inner crown.
  • the passage 8 anterior to the extrusion slot and in which the material circulates in the plastic state prior to extrusion receives a precalibration slot 9 constituted by the adjustable ring 10 inserted around the central core 4.
  • the precalibration slot is thus obtained by the installation of a concentric ring capable of being adjusted in position from the outside by a set of radial screws 11,11 ′.
  • the toothed wheel 6 is driven from the central shaft 12 which drives the eccentric circular cam 13; and the latter therefore causes the nutation movement undergone by the toothed wheel 6, held by the lower plate and the studs 14, 14 ′ secured to the central body 4.
  • the mutation movement could be printed not on the central crown 6 but on an outer crown 3 in this case the central crown 6 is fixed and it defines the inner edge of the extrusion slot whose outer ring defines the outer edge; and this outer ring is then moved by a drive mechanism in a mutation movement, such that the outer ring is constantly in contact with the inner ring according to a contact point moving continuously along the extrusion slot .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Apparatus for manufacturing a tubular film of lacunary structure, of the type in which the tubular film (2), extruded from a circular extrusion slit (1), receives a series of perforations (5, 5') disposed according to a helical path along the walls of the tubular film, the latter being for this purpose extruded by passing between two non- concentric circular rings, including an outer ring (3) constituting the outer wall of the extrusion slit and an inner ring (6), at least one of the two rings being moveable and simulated into a nutational movement about an axis colinear with the axis of the fixed ring, the movement of the moveable circular ring bringing it into permanent contact with the wall of the fixed ring at a point of contact which moves continuously around the perimeter of the fixed ring, one of the rings comprising, on its face in contact with the other ring, indentations suitable for perforating the film in the zone of contact between the two rings, and the apparatus is characterised in that the rings are disposed in such a way in relation to each other that the action of incision and perforation of the moveable ring engaging with the fixed ring is carried out immediately downstream from the extrusion slit (1) and on the film (2) which is no longer held against the wall of the fixed ring. <IMAGE>

Description

La présente invention concerne la fabrication d'un grillage réalisé par extrusion d'une structure en matière synthétique à partir d'une filière circulaire.The present invention relates to the manufacture of a mesh produced by extrusion of a structure in synthetic material from a circular die.

On connaît des procédés dans lesquels la filière extrudant un film qui normalement devrait être continu et réalisant par conséquent un tube plein, subit cependant l'action d'organes notamment de peignes ou dents qui viennent perforer à intervalles (réguliers ou non) la surface du film ; ce film après étirement et élongation réalise un grillage présentant des évidements répartis sur sa surface en fonction de l'action antérieure des peignes ou indentation.Processes are known in which the die extruding a film which normally should be continuous and consequently producing a solid tube, however undergoes the action of organs in particular of combs or teeth which come to perforate at regular or irregular intervals the surface of the movie ; this film after stretching and elongation achieves a grid having recesses distributed over its surface as a function of the previous action of the combs or indentation.

On connaît notamment en vue de cette fabrication un type de tête d'extrusion comportant une fente d'extrusion définie entre deux parois circulaires dont une paroi extérieure ; et sur cette paroi extérieure vient s'appuyer une roue circulaire constamment excentrée et animée d'un mouvement de nutation suivant un axe colinéaire à la fente circulaire d'extrusion.A type of extrusion head is known in particular for this manufacture, comprising an extrusion slot defined between two circular walls including an outer wall; and on this outer wall is supported a circular wheel constantly eccentric and animated by a nutation movement along an axis collinear with the circular extrusion slot.

Dans ces conditions la roue intérieure vient porter sur la paroi extérieure de la fente d'extrusion en suivant un parcours circulaire, de sorte que le point de contact entre la roue intérieure excentrée et animée du mouvement de nutation et la paroi extérieure se déplace (régulièrement de préférence) et dans le même sens le long de cette paroi extérieure.Under these conditions the inner wheel comes to bear on the outer wall of the extrusion slot following a circular path, so that the point of contact between the eccentric inner wheel and driven by the nutation movement and the outer wall moves (regularly preferably) and in the same direction along this outer wall.

Et selon une première forme de réalisation de ce dispositif connu, la roue comporte des indentations sur sa périphérie indentations qui viennent porter sur le film venu de la fente d'extrusion et en appui sur la paroi extérieure, de sorte que ces indentations provoquent la formation d'ouvertures, évidements ou perforations, lesquelles peuvent ensuite être agrandies par étirement en réalisant ainsi une structure lacunaire.And according to a first embodiment of this known device, the wheel has indentations on its periphery indentations which come to bear on the film coming from the extrusion slot and in abutment on the external wall, so that these indentations cause the formation openings, recesses or perforations, which can then be enlarged by stretching, thereby achieving a incomplete structure.

Selon une autre forme de réalisation de ce même dispositif, les indentations sont prévues non pas sur la roue dentée centrale mais sur la paroi extérieure de la fente d'extrusion et la roue centrale qui présente un bord circulaire vient appuyer le film sur les indentations prévues sur cette paroi extérieure en provoquant toujours dans les mêmes conditions la formation d'ouvertures, ajourages ou évidements.According to another embodiment of this same device, the indentations are provided not on the central gear but on the outer wall of the extrusion slot and the central wheel which has a circular edge presses the film on the provided indentations on this outer wall always causing under the same conditions the formation of openings, perforations or recesses.

L'invention concerne des perfectionnements aux dispositifs d'extraction de ce type.The invention relates to improvements to extraction devices of this type.

Dans certaines conditions la matière du film thermoplasti­que sortant de la fente d'extrusion à un état plastique peut venir s'appliquer sur la paroi extérieure de la fente d'extrusion qui constitue précisément une paroi d'appui sur laquelle vient porter la roue dentée intérieure.Under certain conditions the material of the thermoplastic film leaving the extrusion slot in a plastic state can come to be applied to the external wall of the extrusion slot which precisely constitutes a bearing wall on which the internal toothed wheel comes to bear. .

La matière plastique peut alors avoir tendance à adhérer à cette paroi et elle n'en est décollée que par l'appel ultérieur du grillage ; il s'en suit des à-coups liés aux mouvements d'adhérence et de décollement par zône de la matière synthétique ce qui provoque par conséquent des inégalités et des déformations avec un aspect irrégulier et désavantageux des produits.The plastic may then tend to adhere to this wall and it is only peeled off by the subsequent call of the mesh; it follows jerks related to movements of adhesion and detachment by area of the synthetic material which consequently causes inequalities and deformations with an irregular and disadvantageous appearance of the products.

Ce défaut peut être d'autant plus marqué que l'on cherche à obtenir des cadences de production élevée, et pour certaines qualités ou mélange de matière plastique.This defect can be all the more marked when one seeks to obtain high production rates, and for certain qualities or mixture of plastic material.

Pour des débits lents le mouvement de la matière peut suivre les distorsions liées aux adhérences sur la paroi et décrites ci-dessus ; par contre lorsque l'on veut aboutir à des débits plus élevés et à des dimensions de mailles plus denses, le phénomène d'adhérence sur la paroi peut parfois provoquer des conditions de fonctionnement irrégulières et un aspect par conséquent désavantageux.For slow flows the movement of the material can follow the distortions linked to adhesions on the wall and described above; on the other hand when one wants to achieve higher flow rates and denser mesh dimensions, the phenomenon of adhesion to the wall can sometimes cause irregular operating conditions and a consequently disadvantageous appearance.

A cet effet l'invention concerne, pour remédier aux inconvénients ci-dessus, un dispositif pour la fabrication d'un film tubulaire de structure lacunaire, du type dans lequel le film tubulaire extrudé depuis une fente circulaire d'extrusion, reçoit une suite de perforations disposées selon un parcours hélicoïdal le long des parois du film tubulaire, ce dernier étant à cet effet inséré entre deux couronnes circulaires non concentriques dont une couronne extérieure constituant la paroi extérieure de la fente d'extrusion et une couronne intérieure l'une des deux couronnes étant montée mobile et animée d'un mouvement de nutation autour d'un axe colinéaire à l'axe de la couronne fixe, le mouvement de la couronne mobile l'amenant au contact de la paroi de la couronne fixe selon un point de contact qui se déplace continument sur le pourtour intérieur de cette couronne fixe, et une des couronnes comportant sur sa face en contact avec l'autre couronne des indentations propres à perforer le film dans la zone de contact entre les deux couronnes, et le dispositif est caractérisé en ce que les couronnes sont disposées de telle façon l'une par rapport à l'autre que l'action d'incision et de perforation de la couronne mobile, coopèrant avec la couronne fixe, s'opère immédiatement en aval de la fente d'extrusion et sur le film n'étant plus maintenu en appui sur la paroi de la couronne fixe.To this end, the invention relates, to remedy the above drawbacks, a device for manufacturing a tubular film of incomplete structure, of the type in which the tubular film extruded from a circular extrusion slot, receives a series of perforations arranged in a helical path along the walls of the tubular film, the latter being for this purpose inserted between two non-concentric circular rings, one outer ring constituting the outer wall of the extrusion slot and one inner ring one of the two crowns being mounted mobile and animated by a nutation movement around an axis collinear with the axis of the fixed crown, the movement of the mobile crown bringing it into contact with the wall of the fixed crown according to a point of contact which moves continuously on the inner circumference of this fixed crown, and one of the crowns having on its face in contact with the other crown proper indentations es to perforate the film in the contact area between the two crowns, and the device is characterized in that the crowns are arranged in relation to each other that the action of incision and perforation of the movable crown, cooperating with the fixed crown, operates immediately downstream of the extrusion slot and on the film which is no longer held in abutment on the wall of the fixed crown.

Dans ce dispositif on évite ainsi que le film soit repoussé et plaqué, venant en position d'adhérence, sur la paroi de la couronne fixe.In this device, the film is thus prevented from being pushed back and pressed against the wall of the fixed ring, coming into the adhesion position.

L'action de la couronne mobile vient donc repousser le film pour permettre l'incision du film par le jeu des indenta­tions (disposées soit sur la couronne fixe, soit sur la couronne mobile), mais sans provoquer l'appui du film en aval de l'incision sur une paroi appui qui en raison de la nature encore plastique du film récemment extrudé, provoquerait l'adhérence du film sur la paroi d'appui.The action of the movable crown therefore repels the film to allow the incision of the film by the play of indentations (arranged either on the fixed crown or on the movable crown), but without causing the film to be pressed downstream of the incision on a support wall which, due to the still plastic nature of the recently extruded film, would cause the film to adhere to the support wall.

Selon une forme de réalisation plus particulière, le dispositif est caractérisé en ce que la portée de la couronne mobile sur la couronne fixe se fait selon une ligne de contact confondue avec l'angle inférieur et intérieur de ladite couronne fixe.According to a more particular embodiment, the device is characterized in that the range of the movable crown on the fixed crown is made along a contact line coincident with the lower and inner angle of said fixed crown.

Selon encore une autre caractéristique et conformément à une première variante de réalisation les indentations sont disposées sur la couronne intérieure mobile et elles sont orientées dans une direction centrifuge vers la couronne fixe.According to yet another characteristic and in accordance with a first variant embodiment, the indentations are arranged on the movable inner ring and they are oriented in a centrifugal direction towards the fixed ring.

Selon une autre forme de réalisation qui représente une seconde variante les indentations sont disposées sur la couronne fixe et elles sont orientées dans une direction centripète vers la couronne mobile centrale ou intérieure.According to another embodiment which represents a second variant, the indentations are arranged on the fixed crown and they are oriented in a centripetal direction towards the central or internal movable crown.

Selon encore une autre caractéristique représentant un développement important de l'invention le dispositif comporte une fente de précalibrage permettant de déterminer l'épaisseur du film, cette fente étant disposée en amont de la fente d'extrusion.According to yet another characteristic representing an important development of the invention, the device comprises a precalibration slot making it possible to determine the thickness of the film, this slot being arranged upstream of the extrusion slot.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui suit et qui est donnée en rapport avec une forme de réalisation présentée à titre d'exemple non limitatif en se référant à la figure unique des dessins annexés.Other characteristics and advantages of the invention will emerge from the description which follows and which is given in relation to an embodiment presented by way of nonlimiting example with reference to the single figure of the appended drawings.

Dans le dispositif selon l'invention et tel que représenté à la figure annexée la fente d'extrusion 1 permettant l'écoulement du film de matière synthétique 2 est définie par l'espace entre une couronne fixe extérieure 3 et le cylindre central 4. Dans l'exemple de la figure unique les perforations 5,5′ sont obtenues par la jeu de la couronne dentée 6 qui se déplace selon un mouvement de nutation précédemment décrit de sorte que cette couronne soit constamment excentrée par rapport à la fente d'extrusion ; un bord de la couronne dentée est donc constamment en position d'interruption partielle en travers de la fente d'extrusion ; mais ce bord d'interruption se déplace régulièrement et selon un mouvement continu le long de la fente.In the device according to the invention and as shown in the appended figure, the extrusion slot 1 allowing the flow of the film of synthetic material 2 is defined by the space between an outer fixed ring 3 and the central cylinder 4. In the example of the single figure the perforations 5.5 ′ are obtained by the play of the crown toothed 6 which moves according to a nutation movement previously described so that this ring is constantly eccentric relative to the extrusion slot; an edge of the ring gear is therefore constantly in the partially interrupted position across the extrusion slot; but this interrupting edge moves regularly and in a continuous movement along the slit.

Ainsi et de façon connue sont provoquées des perforations dans le film, perforations qui suivent un parcours hélicoïdal le long de la structure tubulaire extrudée.Thus and in known manner are caused perforations in the film, perforations which follow a helical course along the extruded tubular structure.

Dans le cadre de la présente invention les indentations 6a de la couronne dentée sont prévues pour venir face à l'angle 7 correspondant à l'angle intérieur et inférieur de la couronne fixe 3.In the context of the present invention, the indentations 6a of the toothed crown are provided to face the angle 7 corresponding to the interior and lower angle of the fixed crown 3.

De sorte que la couronne 3 s'arrête exactement au niveau de la fente d'extrusion 1 ; et le film dégagé de la fente d'extrusion et subissant l'action des indentations 6a n'est donc plus repoussé contre la paroi de la couronne fixe 3 laquelle s'arrête exactement au niveau de la fente d'extrusion, selon l'angle inférieur extérieur 7.So that the crown 3 stops exactly at the level of the extrusion slot 1; and the film released from the extrusion slot and undergoing the action of the indentations 6a is therefore no longer pushed against the wall of the fixed crown 3 which stops exactly at the level of the extrusion slot, according to the angle lower exterior 7.

On évite ainsi le phénomène d'adhérence du film 2 contre la partie inférieure de la paroi de la couronne 3, partie inférieure qui est ici inexistante.This avoids the phenomenon of adhesion of the film 2 against the lower part of the wall of the crown 3, the lower part which is nonexistent here.

Selon une autre forme de réalisation non représentée aux dessins, les indentations pourraient être présentes précisément au niveau de l'angle intérieur et inférieur 7 de la couronne 3 et recevoir l'appui de la couronne mobile intérieure 6 laquelle offrirait un bord circulaire continu venant alors coopérer avec les indentations de la couronne fixe pour obturer passagèrement la zone de la fente d'extrusion dans laquelle la couronne mobile vient au contact de la couronne fixe ; cette zone d'obturation se déplaçant avec le mouvement de nutation de la couronne intérieure mobile.According to another embodiment not shown in the drawings, the indentations could be present precisely at the level of the interior and lower angle 7 of the crown 3 and receive the support of the interior movable crown 6 which would offer a continuous circular edge then coming cooperate with crown indentations fixed to temporarily close the area of the extrusion slot in which the movable ring comes into contact with the fixed ring; this obturation zone moving with the nutation movement of the movable inner crown.

Selon une autre caractéristique de l'invention on voit que le passage 8 antérieur à la fente d'extrusion et dans lequel circule la matière à l'état plastique préalablement à l'extrusion, reçoit une fente de précalibrage 9 constituée par la bague réglable 10 insérée autour du noyau central 4.According to another characteristic of the invention, it can be seen that the passage 8 anterior to the extrusion slot and in which the material circulates in the plastic state prior to extrusion, receives a precalibration slot 9 constituted by the adjustable ring 10 inserted around the central core 4.

Et la fente de précalibrage est ainsi obtenue par la mise en place d'une bague concentrique susceptible d'être ajustée en position depuis l'extérieur par un jeu de vis radiales 11,11′.And the precalibration slot is thus obtained by the installation of a concentric ring capable of being adjusted in position from the outside by a set of radial screws 11,11 ′.

On obtient ainsi un ajustement très précis de l'épaisseur du film préalablement à son passage dans la fente d'extrusion définitive ce qui permet d'obtenir une parfaite régularité dans le film en évitant une déformation postérieure à l'extrusion consécutive au relâchement des contraintes internes et à la décompression de ce film au sortir de la filière d'extrusion.A very precise adjustment of the thickness of the film is thus obtained before it passes through the final extrusion slot, which makes it possible to obtain perfect regularity in the film, avoiding post-extrusion deformation following the relaxation of the stresses. internal and decompression of this film out of the extrusion die.

Dans l'exemple représenté, l'entraînement de la roue dentée 6 se fait depuis l'arbre central 12 qui entraîne la came circulaire excentrée 13 ; et cette dernière provoque donc le mouvement de nutation subi par la roue dentée 6, maintenue par la plaque inférieure et les plots 14,14′ solidaires du corps central 4.In the example shown, the toothed wheel 6 is driven from the central shaft 12 which drives the eccentric circular cam 13; and the latter therefore causes the nutation movement undergone by the toothed wheel 6, held by the lower plate and the studs 14, 14 ′ secured to the central body 4.

On comprend que le mouvement de mutation, selon une nouvelle variante pourrait être imprimé non pas à la couronne centrale 6 mais à 1 a couronne extérieure 3 dans ce cas la couronne centrale 6 est fixe et elle définit le bord intérieur de la fente d'extrusion dont la couronne extérieure définit le bord externe ; et cette couronne extérieure est alors mue par un mécanisme d'entraînement dans un mouvement de mutation, tel que la couronne extérieure soit constamment en contact avec la couronne intérieure selon un point de contact se déplaçant de façon continue le long de la fente d'extrusion.It is understood that the mutation movement, according to a new variant could be printed not on the central crown 6 but on an outer crown 3 in this case the central crown 6 is fixed and it defines the inner edge of the extrusion slot whose outer ring defines the outer edge; and this outer ring is then moved by a drive mechanism in a mutation movement, such that the outer ring is constantly in contact with the inner ring according to a contact point moving continuously along the extrusion slot .

Claims (7)

1 - Dispositif pour la fabrication d'un film tubulaire de structure lacunaire, du type dans lequel le film tubulaire (2) extrudé depuis une fente circulaire d'extrusion (1), reçoit une suite de perforations (5,5′) disposées selon un parcours hélicoïdal le long des parois du film tubulaire, ce dernier étant à cet effet extrudé par passage entre deux couronnes circulaires non concentriques dont une couronne extérieure (3) constituant la paroi extérieure de la fente d'extrusion et une couronne intérieure (6), l'une des deux couronnes étant mobile et animée d'un mouvement de nutation autour d'un axe colinéaire à l'axe de la couronne fixe, le mouvement de la couronne circulaire mobile l'amenant au contact permanent de la paroi de la couronne fixe selon un point de contact qui se déplace continument sur le pourtour de la couronne fixe, une des couronnes comportant sur sa face en contact avec l'autre couronne des indentations propres à perforer le film dans la zone de contact entre les deux couronnes, et le dispositif est caractérisé en ce que les couronnes sont disposées de telle façon l'une par rapport à l'autre que l'action d'incision et de perforation de la couronne mobile, coopèrant avec la couronne fixe, s'opère immédiatement en aval de la fente d'extrusion (1) et la portée de la couronne mobile (6) sur la couronne fixe (3) se fait selon une ligne de contact confondue avec l'angle inférieur et intérieur (7) de ladite couronne fixe (3).1 - Device for the production of a tubular film of incomplete structure, of the type in which the tubular film (2) extruded from a circular extrusion slot (1), receives a series of perforations (5.5 ′) arranged according to a helical path along the walls of the tubular film, the latter being for this purpose extruded by passing between two non-concentric circular rings including an outer ring (3) constituting the outer wall of the extrusion slot and an inner ring (6) , one of the two crowns being mobile and animated by a nutation movement around an axis collinear with the axis of the fixed crown, the movement of the mobile circular crown bringing it into permanent contact with the wall of the fixed crown according to a contact point which moves continuously around the periphery of the fixed crown, one of the crowns having on its face in contact with the other crown indentations suitable for perforating the film in the conta ct between the two crowns, and the device is characterized in that the crowns are arranged in such a way with respect to each other that the action of incision and perforation of the movable crown, cooperating with the fixed crown , operates immediately downstream of the extrusion slot (1) and the range of the movable crown (6) on the fixed crown (3) is along a contact line coincident with the lower and inner angle (7 ) of said fixed crown (3). 2 - Dispositif selon la revendication 1,
caractérisé en ce que la couronne intérieure (6)est mobile et animée d'un mouvement de nutation l'amenant au contact du pourtour intérieur circulaire de la couronne extérieure fixe (3)selon un point de contact se déplaçant le long de ce pourtour circulaire.2 - Device according to claim 1,
characterized in that the inner crown (6) is movable and animated by a nutation movement bringing it into contact with the circular inner periphery of the fixed outer crown (3) according to a contact point moving along this circular periphery . 3 - Variante du dispositif selon la revendication 1,
caractérisé en ce que la couronne extérieure (3) est mobile et animée d'un mouvement de nutation autour de la couronne centrale (6) fixe.3 - variant of the device according to claim 1,
characterized in that the outer crown (3) is movable and animated by a nutation movement around the fixed central crown (6). 4- Dispositif selon la revendication 2,
caractérisé en ce que les indentations sont disposées sur la couronne intérieure mobile (6) et elles sont orientées dans une direction centrifuge vers la couronne fixe (3).4- Device according to claim 2,
characterized in that the indentations are arranged on the movable inner ring (6) and they are oriented in a centrifugal direction towards the fixed ring (3). 5- Dispositif selon la revendication 2,
caractérisé en ce que les indentations sont disposées sur la couronne extérieure fixe (3) et elles sont orientées dans une direction centripède vers la couronne mobile (6) centrale ou intérieure.5- Device according to claim 2,
characterized in that the indentations are arranged on the fixed outer crown (3) and they are oriented in a centripedal direction towards the central or inner movable crown (6). 6- Dispositif selon l'une des renvendications 1 à 5,
caractérisé en ce qu'il comporte une fente de précalibra­ge (9) permettant de déterminer l'épaisseur du film, cette fente étant disposée en amont de la fente d'extrusion.6- Device according to one of claims 1 to 5,
characterized in that it comprises a precalibration slot (9) making it possible to determine the thickness of the film, this slot being arranged upstream of the extrusion slot. 7- Dispositif selon la revendication 6,
caractérisé en ce que la fente de précalibrage (9) est obtenue par la mise en place d'une bague concentrique (10) susceptible d'être ajustée en position autour du noyau central (4) depuis l'extérieur par un jeu de vis radiales (11,11′).7- Device according to claim 6,
characterized in that the precalibration slot (9) is obtained by placing a concentric ring (10) capable of being adjusted in position around the central core (4) from the outside by a set of radial screws (11.11 ′).
EP90400373A 1989-02-13 1990-02-12 Apparatus for manufacturing nettings with perforations or hollows distributed over their surfaces Expired - Lifetime EP0383664B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901827A FR2643013B1 (en) 1989-02-13 1989-02-13 DEVICE FOR THE PRODUCTION OF GRIDS INCLUDING ADJUSTMENTS OR RECESSES DISTRIBUTED ON THEIR SURFACE
FR8901827 1989-02-13

Publications (2)

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EP0383664A1 true EP0383664A1 (en) 1990-08-22
EP0383664B1 EP0383664B1 (en) 1994-09-07

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Application Number Title Priority Date Filing Date
EP90400373A Expired - Lifetime EP0383664B1 (en) 1989-02-13 1990-02-12 Apparatus for manufacturing nettings with perforations or hollows distributed over their surfaces

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EP (1) EP0383664B1 (en)
DE (1) DE69012166T2 (en)
ES (1) ES2020762A6 (en)
FR (1) FR2643013B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675074A1 (en) * 1991-04-10 1992-10-16 Hureau Jacques METHOD AND DEVICE FOR THE CONTINUOUS MANUFACTURE OF FILMS OR SHEETS OF THERMOPLASTIC MATERIAL AND LACUNAR STRUCTURE.
CN103434158A (en) * 2013-08-30 2013-12-11 山东通佳机械有限公司 Axial rectilinear motion network pipe forming device and method

Citations (8)

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Publication number Priority date Publication date Assignee Title
FR2131842A6 (en) * 1971-03-30 1972-11-17 Labarre M Mesh extrusion die - using a shear cutter instead of a stamp to reduce tool wear
FR2160270A1 (en) * 1971-11-17 1973-06-29 Hureau Jean Claude Mesh extrusion die - with knives alternately releasing strand and hoop extrudates
FR2161842A1 (en) * 1971-12-03 1973-07-13 Hureau Jean Claude Mesh extrusion dies - for cutting holes in helical or hoop arrays in a tubular extrudate
US3841815A (en) * 1971-12-02 1974-10-15 M Labarre Machine for producing perforated sleeves
FR2349432A1 (en) * 1976-04-29 1977-11-25 Hureau Jacques A tubular mesh extrusion die with a pressure face opposing the cutter - to eliminate melt deformation and blind mesh
EP0109470A1 (en) * 1982-11-19 1984-05-30 Sarl Sign Extrusion die for thermoplastic tubular film
FR2572991A1 (en) * 1984-11-13 1986-05-16 Nortene Sa TUBULAR SHEATH OF PLASTIC MATERIAL AND DEVICE FOR REALIZING SAME
FR2584651A1 (en) * 1985-07-11 1987-01-16 Hureau Jean METHOD AND DEVICE FOR PRODUCING ADJUSTED WALL FILMS

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2131842A6 (en) * 1971-03-30 1972-11-17 Labarre M Mesh extrusion die - using a shear cutter instead of a stamp to reduce tool wear
FR2160270A1 (en) * 1971-11-17 1973-06-29 Hureau Jean Claude Mesh extrusion die - with knives alternately releasing strand and hoop extrudates
US3841815A (en) * 1971-12-02 1974-10-15 M Labarre Machine for producing perforated sleeves
FR2161842A1 (en) * 1971-12-03 1973-07-13 Hureau Jean Claude Mesh extrusion dies - for cutting holes in helical or hoop arrays in a tubular extrudate
FR2349432A1 (en) * 1976-04-29 1977-11-25 Hureau Jacques A tubular mesh extrusion die with a pressure face opposing the cutter - to eliminate melt deformation and blind mesh
EP0109470A1 (en) * 1982-11-19 1984-05-30 Sarl Sign Extrusion die for thermoplastic tubular film
FR2572991A1 (en) * 1984-11-13 1986-05-16 Nortene Sa TUBULAR SHEATH OF PLASTIC MATERIAL AND DEVICE FOR REALIZING SAME
FR2584651A1 (en) * 1985-07-11 1987-01-16 Hureau Jean METHOD AND DEVICE FOR PRODUCING ADJUSTED WALL FILMS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675074A1 (en) * 1991-04-10 1992-10-16 Hureau Jacques METHOD AND DEVICE FOR THE CONTINUOUS MANUFACTURE OF FILMS OR SHEETS OF THERMOPLASTIC MATERIAL AND LACUNAR STRUCTURE.
EP0512877A1 (en) * 1991-04-10 1992-11-11 S A M E X Method and apparatus for the continuous manufacturing of thermoplastic films or sheets with a net structure
ES2058010A2 (en) * 1991-04-10 1994-10-16 Samex Method and apparatus for the continuous manufacturing of thermoplastic films or sheets with a net structure.
CN103434158A (en) * 2013-08-30 2013-12-11 山东通佳机械有限公司 Axial rectilinear motion network pipe forming device and method
CN103434158B (en) * 2013-08-30 2015-11-18 山东通佳机械有限公司 Axial linear movement webmaster shaped device and method

Also Published As

Publication number Publication date
ES2020762A6 (en) 1991-09-16
DE69012166T2 (en) 1995-05-04
FR2643013A1 (en) 1990-08-17
FR2643013B1 (en) 1991-04-19
EP0383664B1 (en) 1994-09-07
DE69012166D1 (en) 1994-10-13

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